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Finding the Fourth Proportional to 10,515.60, 15,805.80 and 9,932.40

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Solution

The fourth proportional to 10,515.60, 15,805.80 and 9,932.40 is: 14,929.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,515.60 : 15,805.80 = 9,932.40 : x
  2. Step 2: Convert to fraction form
    10,515.60/15,805.80 = 9,932.40/x
  3. Step 3: Cross multiply
    10,515.60x = 15,805.80 × 9,932.40
  4. Step 4: Simplify right side
    10,515.60x = 156,989,527.92
  5. Step 5: Solve for x
    x = 156,989,527.92/10,515.60
  6. Step 6: Final answer
    x = 14,929.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.